Hi:
The window function works for me (with adding limit 1 in the end to output only one row needed instead of many duplicate rows).
thanks very much.
On Thu, Sep 3, 2015 at 6:51 AM, Dickson S. Guedes <listas@xxxxxxxxxxxxx> wrote:
On Wed, Sep 02, 2015 at 07:14:40PM -0400, Tom Smith wrote:
> Hi:
>
> I need to get the first and last tow in one sql like below
>
> select first(col1), last(col1) from table order by col1
Have you tried the window functions [1] last_value and first_value?
You could use something like:
SELECT first_value(col1) over (order by col1),
last_value(col1) over (order by col1)
FROM table;
It should be as simple as that, or I miss your point.
[1] http://www.postgresql.org/docs/current/static/functions-window.html
[]s
--
Dickson S. Guedes
@guediz - http://github.com/guedes
